纯css写一个带动画的弹框 visibility + opcity

css能实现各种各样的动态效果，比js实现简单，性能也比js实现高，现在我们就用纯css实现弹窗，主要用到了两个属性 opcity 和 visibility，

opctiy 这个属性很简单控制元素透明度，visibility控制元素的显示和隐藏，他和display有一个很重要的区别，visibility可以用transition来进行过渡,而display并不可以，这就是我们不用display的原因

可以配合上transform: scale() 让弹窗更有动态感觉

全部代码：

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>纯css弹窗动画</title>
</head>
<style>
  * {
    margin: 0;
    padding: 0;
  }


  .alert-box {
    top: 0;
    left: 0;
    z-index: 999;
    position: fixed;
    width: 100vw;
    height: 100vh;
    background-color: rgba(0, 0, 0, 0.3);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 16px;
    visibility: hidden;
    opacity: 0;
    transition: all 0.3s ease-in-out;
  }

  .alert-content {
    height: 130px;
    width: 300px;
    background-color: #ffffff;
    border-radius: 10px;
    padding: 12px 18px;
    transform: scale(0.8);
    transition: all 0.3s ease-in-out;
  }

  .alert-title {
    height: 50px;
    line-height: 50px;
    font-size: 18px;
  }

  .alert-info {
    height: 50px;
    line-height: 50px;
    font-size: 16px;
  }

  .alert-buttons {
    display: flex;
    justify-content: flex-end;
    font-size: 16px;
  }

  .alert-buttons>div {
    height: 30px;
    line-height: 30px;
    margin-left: 17px;
    width: 56px;
    text-align: center;
    font-size: 16px;
    border-radius: 3px;
    cursor: pointer;
  }

  .alert-submit {
    background: #409eff;
    color: #fff;
  }

  .alert-cancle {
    border: 1px solid #ccc;

  }

  .open {
    margin: 20px;
    height: 30px;
    width: 50px;
  }

  .show {
    visibility: visible;
    opacity: 1;
  }

  .show .alert-content {
    transform: scale(1);
  }

</style>

<body>
  <button class="open" onclick="openAlert()"> 打开 </button>
  <div class="alert-box" id="alertBox">
    <div class="alert-content">
      <div class="alert-title">提示</div>
      <div class="alert-info">提示框的内容</div>
      <div class="alert-buttons">
        <div class="alert-cancle" onclick="hiddenAlert()">取消</div>
        <div class="alert-submit" onclick="hiddenAlert()">确定</div>
      </div>
    </div>
  </div>
</body>

<script>

  function openAlert() {
    document.getElementById("alertBox").classList.add(‘show‘)
  }
  function hiddenAlert() {
    document.getElementById("alertBox").classList.remove(‘show‘)
  }
</script>

</html>

纯css写一个带动画的弹框 visibility + opcity

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